There are some old threads about a TSB for the radio fading from stereo to mono. Replacement was the cure, at least if the car was under warranty. A lot of folks seemed to have developed the problem after it was discovered the replacement radio module was the latest version and Sirius compatible. :thumbsup:My M5 radio suddenly sounds like the antenna connection is loose (it's not). The stations come in...but poorly. Sound familiar out there?